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<div class="document" id="char-lcd">
<h1 class="title">char_lcd</h1>
<div class="section">
<h1><a id="overview" name="overview">Overview</a></h1>
<p>This is a simple example project for the MSP430 series MCU and the GCC port
of the mspgcc project. The project contains a makefile and uses assembler
and C sources. It shows a clock on an character LCD.</p>
<p>Features:</p>
<ul class="simple">
<li>How to use a character LCD.<ul>
<li>Download font with custom characters</li>
<li>It contains a reusable LCD C-module</li>
</ul>
</li>
<li>How to use (wakeup) interrupts in C<ul>
<li>Sync foreground with interrupt by using the lowpower modes</li>
</ul>
</li>
<li>Use printf to print formated strings and do a printf
emulation that prints to the LCD.</li>
<li>Using the Timer_A as realtime clock</li>
<li>Makefile<ul>
<li>Compile and link</li>
<li>Convert to intel hex format</li>
<li>Generate a listing with mixed C / assembly</li>
</ul>
</li>
</ul>
</div>
<div class="section">
<h1><a id="required-hardware" name="required-hardware">Required hardware</a></h1>
<ul>
<li><p class="first">A MSP430F1121 or larger device (any from the F1x series)</p>
</li>
<li><p class="first">Any character type display with a HD44780 controler or compatible
(e.g. a KS0066 16x2 type was used for developement).
Connections for a four bit interface (LCD->MSP):</p>
<pre class="literal-block">
RS -> P1.1
R/W -> P1.2
E -> P1.3
D4 -> P1.4
D5 -> P1.5
D6 -> P1.6
D7 -> P1.7
</pre>
<p>Many LCD controllers run from 3 volts, but the display requires a
voltage difference of more than 3 volts for the contrast. This means
a negative voltage is needed on the contrast pin (usualy named VEE or
VO)</p>
</li>
<li><p class="first">Watch crystal 32.768kHz</p>
</li>
<li><p class="first">Optionaly a LED on P2.5 (470 Ohms series resistor to GND)</p>
</li>
</ul>
</div>
<div class="section">
<h1><a id="source" name="source">Source</a></h1>
<p><a class="reference" href=".">Files</a>:</p>
<ul class="simple">
<li><a class="reference" href="README.txt">README.txt</a> This file</li>
<li><a class="reference" href="font.c">font.c</a> Bitmaps of downloadable characters</li>
<li><a class="reference" href="font.h">font.h</a></li>
<li><a class="reference" href="hardware.h">hardware.h</a> Pins and port descriptions</li>
<li><a class="reference" href="lcd.c">lcd.c</a> HD44780 control code</li>
<li><a class="reference" href="lcd.h">lcd.h</a> HD44780 control code function prototypes and constants</li>
<li><a class="reference" href="main.c">main.c</a> Main application</li>
<li><a class="reference" href="makefile">makefile</a> Build rules</li>
</ul>
</div>
<div class="section">
<h1><a id="disclaimer" name="disclaimer">Disclaimer</a></h1>
<p>This example is part of the mspgcc project <a class="reference" href="http://mspgcc.sf.net">http://mspgcc.sf.net</a>.
See <a class="reference" href="../license.html">license.txt</a> for details.</p>
<p>chris</p>
<hr class="docutils" />
<p><a class="reference" href="../readme.html">back</a></p>
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